ABB ACS880-01 Series, Firmware Instructions

Page: 434 / 664

434 Parameters
ESP CW bit 8 Parameter 74.01 ESP control word , bit-8 status controls
enable/disable status of the function.
10
Other Source selection (see Terms and abbreviations on page 148 ). -
79.41 Overload limit type Selects the type of limit used for overload supervision.
The user has option to choose either a fixed limit, a curve of a
predefined shape or plot a custom curve as a function of
motor speed. Fixed limit
Fixed limit Fixed limit is a constant value for all speeds.
Linear Overload limit is calculated by formula:
I
lim
= I
set
* (F
act
/ F
max
)
Where,
I
lim
= 79.90 Overload actual limit
I
set
= 79.43 Overload limit
F
max
= 79.09 Load limit speed scale
F
act
= Actual speed
Quadratic Overload limit is calculated by formula:
I
lim
= I
set
* (F
act
/ F
max
)
2
Where,
I
lim
= 79.90 Overload actual limit
I
set
= 79.43 Overload limit
F
max
= 79.09 Load limit speed scale
F
act
= Actual speed
User curve Overload limit depends on the user input load curve, actual
speed/frequency and Overload supervision input.
79.42 Overload
supervision signal Defines the source for the supervision signal used in the
overload protection. Motor current
%
NULL Zero 0
AI1 scaled 12.12 AI1 scaled value (see page 197 ). 1
AI2 scaled 12.22 AI2 scaled value (see page 199 ). 2
FBA1 ref 03.05 FB A reference 1 (see page 156 ). 3
FBA2 ref 03.06 FB A reference 2 (see page 156 ). 4
EFB1 ref 03.09 EFB reference 1 (see page 156 ). 5
EFB2 ref 03.10 EFB reference 2 (see page 156 ). 6
Estimated motor
current Parameter 09.13 Motor current estimated (see page 183 ). 7
Motor current % Estimated motor current in % of nominal motor current. 8
Other Source selection (see Terms and abbreviations on page 148 ). -
79.43 Overload limit Defines overload limit value.
Note: This parameter is not applicable in case User curve is
selected for the overload curve shape in parameter 79.41
Overload limit type .
100.00
0.00...30000.00 Overload fixed limit. 10 = 1
79.47 Overload delay type Selects the type of overload delay time setting.
The user has option to choose between fixed and floating
delay calculation methods. Constant
Constant Overload limit depends on the user input load curve, actual
speed/frequency and Overloadload supervision input.
No. Name/Value Description Def / FbEq16